Improvement in peopellebs



ROBERJT HUNTER, or NEW YORK, N. v.

Letters Patent No. 79,657, dated July 7, 1868.

IMPROVEMENT IN PROPELLERS.

eige Stimuli aferra tu in tlgese tettet tant ma making ,mrt nf tige sans.

TO ALL WHOM IT MAY CONCERN:

Be it known-that I, ROBERT HUNTER, of No. 9 Brevoort Place, in the city of New York, and State of New York, United States of America, have invented a new and improved Propeller for Steam-Vessels; and I do hereby declare that the following description furnishes. a full, clear, and exact account thereof,' sn iricient to enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, as forming part of this specification. v I y The invention consists of one or more levers placed in a vertical position through the stern,rsides, o'r bottom of a vessael, and caused vto vibrate on an axis between two given points by means of a horizontal engine, ,the connecting-rod of which is attached to the end of the lever above the axis, while the lower end of the said lever is immersed in the water, and furnished with a hollow. or concave structure, so fashioned as to offer the least possible resistance to the 'water while moving in the line ofthe vessels motion, and the greatest possible resistance when moved by the lever in the opposite direction.

In the accompanying sheet of drawingsi A represents the stern of a vessel, B the lever adjustedthereto, and working on centre D. V

C represents the hollow or concave structure aforementioned, with which the lever` B is furnished.

E represents the connecting-rod attached to the upper end of the said lever.

F represents the cylinder, and G the piston of 'the engine.

Figures 3 to 10, inclusive, show diiferent forms in which the apparatus attached to the lower extremity of the lever may be constructed. n

ItV will be understood from the above description that the movement of the piston' Gr will cause the lever, and the propelling-apparatus with which its lower extremity is furnished, to move backwards and forwards between the points h h. The impinging-surfaceowing toits hollow or concave form, loi'ers. the greatest resistance in its action against the water, -while itsexternal surface, being of a sloping or angular shape towards theline of the ves-sels movement, reduces the reaction to the lowest possible quantity. l

It will also be` apparent that the construction and adaptation of this inventionI to vessels ycan be accomplished-at little cost, while its great simplicity and strength render it less liable to be deranged or damaged than the propellers ordinarily used. The engine, too, is distinguished for muehsimplicity, and the expensive and complicated driving-mechanism of other methods.Y completely dispensed with. Y

The following is what I claim as new, and desire to secure by Letters Patent:

The propelling-apparatus herein described, consisting of a hollowitapering bucket, G, vi'brated by a. lever Y B, under the stern or run ofthe vessel, substantially as specified.

ROBERT HUNTER.

`Witnessesz OCTAVIUS KNIGHT, J. E. M.4 BOWEN. 

